United Airlines missed flight policy offers several options for passengers. If you miss your flight, you can try for a same-day standby at no extra charge or a confirmed same-day change for a fee, depending on availability. If you don’t show up and haven’t arranged anything with the airline, you might lose the value of your ticket. If United is responsible for the delay or cancellation, they’ll rebook you at no extra cost. It’s best to contact United immediately if you miss your flight. Travel insurance is recommended to cover any additional costs due to missed flights.